@Charlie M, from the guidelines:

• If you are requesting an image which is still to be cut-out, please do so as a source type.

• If you are uploading an image which is ready to be added into the megapack, please do so as a game ready type. Kindly ensure that it follows the guidelines for cutters outlined in this thread, particularly in terms of image dimensions and quality, the need to include a collar and to avoid snow and how the image is cropped etc. We also strongly recommend using remove.bg to get an initial draft cut by having the background removed from sources. It is also free, very easy to use and there are video and text tutorials in the above-linked post on how to use it, both with Photoshop and with the free image-editing online app photopea.com.